Centrifugal pump



(No Model.) 2 sheetsset 1.. S. HUGHES..

l CENTRIFUGAL PUMP. No. 533,956. Patented Feb. 12, 1895 I UNITED STATES :PATENT OFFICE. r

SAMUEL HUGH ES, OF CHARLESTON, SOUTH OAROLINA.

CENTRIFUGZAL PUMP.

SPECIFICATIQN forming part of Letters P atent No. 533956, dated Z'ebruary 12, 1895.

j Application fil'ed March 18, 1893. Renewed January 1895. Serial Ne. 534,491 (No model.)

To nd whom ?Jimmy concern g A Be t known that I, SAMUEL HUGHES, of Charleston, in the county of Charleston and State of South Carolina, have invented certain new and useful Improvements in Centrifugal Pumps; and I do hereby declare the followng to be -a' full, clear, and exact 'description of the invention, such as will enable others sklled in the art to which it appertains to make and use the same.

My invention relates to an improvementin centrifugal pumps, the'object of the invention being to provide a pump which shall be efficient in operation; adapted to allow of the" passage through it of obstacles of considerable sze wthout injury to the pump, and to cheapen the cost of Construction.

preferably cast` integral with the bed plate.

Saddle B is formed with a concave bearing a.

- Pump casing C has a' projecting annular flangeb cast integral therewith which is pro- 4 Vided with any desired number of bolt holes c. Flange b isturned down true and is seated on the concave hearing a of the' saddle and'is secured in place by means of bolts d passing through the flanges and screwedinto the saddle. The bolt holes cin the flange are formed so as to register with the holes in the saddle,

and thus enable the pump casing to besecured to the saddle so that the discharge branch will be in the position in which it is desired to direct the flow of water. .By means 'of the Construction described,- the pump cas-` ing may be readily secured to the bed plate or base so' as to discharge the water either upwardly, downwardly or laterally. In addition to this feature of adj ustment, the construction in question insures a firm and reliable bearing for the pump casing. i

On the end of the bed plate opposite the saddle is'bolted a standard D the upper end of which is furnished with a shaft bear-ing d' for theouter end of the pump shat't E. A band pulley F is fastened to shaft E, between the bearing d and the pump casing.

The pump casing comprises the inner head G, periphery G' and extended bearing or journal G all of which paris are preferably cast in a single piece. The periphery G' is formed with an outwardly projecting flange g to which is bolted a similar flange g' formed on the outer head H. Suitable packing is interposed between these fianges to prevent leakage. Outer head H is constructed with a suction branch h which is provided with a perforated flangeh' for tion pipe. j

I represents the disk of the punp wheel which is formed with a hub I' which is seeurely fastened to one end of the shaft E. In order to accommodate a hub which shall be sufficiently strong and also have an extended bearing on the shaft, without obstructing the passage'for the infiow of water, I form the casing with an outwardly fiaring central portionf, and the hub I' ot' corresponding shape so that a portion ot the latter will extend into the space thus formed in the hub. The bearing or journal Gr is lined with Babbitt metal iwhich forms a hearing for one end of the shaft. Bearing or journal Gr has the cars j cast thereon on its oppos'ite sides. These ears are perforated and receive the bolts K which serve to secure the stufiing box gland M in place. The outer end ot' hearing or journal -Gr is constructedwith a packing receptaclel in which packing is inserted around the shaft for preventing any leakage between the bearing or journal and shaft.

Disk I is constructed with any desired number of wings, six being shown in the present instance. Of this number the three wings N, N, N, are designated as the suction wings, and the three wings O, O, O as the discharge wings. All ot these wings are connected at one side with the disk, the outer face of which runs in close proximity to the inner surface of the head, but not in contact therewith.- These wings project outwardly from the disk, their outer si des'eXtending nearly to the other head of the pump casing, so that in width the wings the attachment of a suci are slightly less than the transverse space between the heads. Wings or blades N are eurved rearwardly with relation to the direction of rotation of the wheel and are located about midway between the shaft and perimeter of the casing, so a free and open space is provided between the inner ends of the wings at which point the water is received fron the suction branch-and also afree space is provided between the enter ends of the wings and the perimeter of the easing. The wings O are eurved in a direction reverse to that of the wings N, their outeends being located near the perineter of the easing only a suilicient space being provided between such parts as will prevent actual contact or wear. XVingsO are comparatively narrew, their width being about equal to the space between the outer ends of wings N and the perimeter of the casing. Owing to the fact that the wings N are located near the center of the casing while the wings O are located near the perimeter of the casing, the wings O will travel faster and through a greater space than wings N and hence are made of correspondingly less area, the object being to so proportion the relative areas of the wings N and O, and so shape them that the eurved wings N N N lift the water after the manner of the action of a heart cam, while the wings O are reversely eurved or practieally straight and tend to force the water in a direction tangential to the perimeter of the casing imparting the desired eentrifugal action to the water. In other words although I have designated the two forms oi' wings as suction and discharge wings to distinguish them they may both perform both functions more or less, but the so called suction wings N N N alone will only lift the waterslightly whereas the discharge wings O O O impart eentrifugal force to the water before it leaves the pump and in this way acoelerates the velocity of its discharge. The suction wings act as cams to force the water outwardly while the discharge wings give it a whirling motion thereby imparting a centrifugal velocity; and it is by combining these two in a single pump wheel and requiring each to do that portion of the work it is best fitted to do that I get the best results.

By reference to the drawings it will be observed that the interior of the casing is for-med coneentric with the shaft from the pointl to the point m, while from latter point to the point n the casing is gradually enlarged to insure the clearance space Q, while from point n to the outer end of the outer wall of the discharge branch, the casing is practically straight. The wings O at all times tend to force the water in a line tangential to the perimeter of the casing and hence the water is forced into the clearance space Q and outwardly along the straight walls of the discharge branch, and in its passage is subjected to the minimum friction and obstruction.

A free and unobstrneted space R is provided between the inner ends of wings N which space is opposite the suction branch the diameter of which is greatest atits juncture with the casing. By means of this construetion quite large objects may enter and pass through the pump without danger of injuring or breaking the wings or other pa'ts of the pnmp.

To relieve the end thrust on the pump shaft, the disk is cut away as much as possible, consistent with its strength and durability, whereby its area is redueed and the pressure tending to force the pump wheel laterally toward the suction branch is reduced to the minimum. i

By arranging the suction wings intermediate the discharge wings, and so proportioniug the areas of the wings that the discharge wings will operate to discharge the water from the casing as rapidly as it is drawn therein by the suction wings, a most uniforrn and effective operation is insured.

As it is evident that slight changes in the form, relative proportions and the constrnction of parts might be resorted to without departing from the essence of my invention I would have it understood that I do not restrict myself to the precise construction shown and described, but,

Having fully described my in vention, what I claim as new, and desire to secure by Letters Patent, is-- l. In a centrifugal punp, a pump wheel constructed with eurved suction wings adapted to have a cam action upon the wat-er, and reversely eurved discharge wings located between the suction wings and outside of the path described by the suction wings, substantially as set forth.

2. In a centrifugal pump, a pump wheel comprising suction wings eurved reversely to the direction of rotation of the wheel, and discharge wings located intermediate the suction wings and extending nearly to the pcrimeter of the casing, said discharge wings eurved reversely to the curve of the suction wings, substantially as set forth.

3. In a centrifugal pump, a pump wheel consisting of a disk formed with outwardly projecting long and short arms alternately arranged, one set of arms having suction wings and the other discharge wings, the two sets eurved oppositely, the path of one set outside of the path of the other set, substantially as set forth.

4:. Iu a centrifngal pump, apump wheel consisting of suction wings eurved reversely to the direction in which they rotate and discharge wings alternately arranged relative to the suction wings, said discharge wings eurved in the direction of the rotation of the wings and traveling in the space between the path of the snctionwings and the inner wall of the easing of the pump, substantially as set forth.

5. The combination with a casing of a centrifugal pump, of a pump wheel consisting of IIO IIS

a disk formed with outwardly projeeting long In testimony where'of I have signed this and short armsalternately arranged, one set speeification in the presence of two subseribro of arms havingsuction wings curved in one ing witnesses.

direction and .traveling in a path some dis tanee within the wall of the casing and the A SAML' U E other set of arms having discharge wings Witnesses: which traverse the inne' curved Wall of the' S.. G. N OTTINGHAM, easing, substantially as set forth. V. E. HODGES. 

